Steel square



(No Model.)

J. GZU'CK. STEEL SQUARE.

2 Sheena-"Sheet l.

Patented July v24, 1894.

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(No Model.)

J.G.ZU0K. STEEL SQUARE.

Patenfed July 24, 1894.`

2 Sheets-Shet 2.

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PATENT Erice.

, JOI-I GEORG ZUCK, OF CLEVELAND, OHIO.

STEEL SQUARE.

SPECIFICATION forming part of Letters Patent No. 523,500, dated July 24, 1894.

Application tiled February 1'7, 1894. Serial No. 500,600. (No model.)

in length and the other from sixteen to eight-v een inches, these two members being solidly connected at their point of intersection. An instrument soconstructed and of the dimensions above stated is cumbersome and awkward to carry as a box large enough to contain it is much larger than is necessary to hold the other tools that usually form a workmans kit, and is unwieldy; or if the box is made to suit the other tools, one member of the square necessarily projects out of it a long distance. I seek to overcome these objections and to secure some other incidental advantages by making a foldingsteel square which may be folded and packed ina `small space and also, if desired, used as a bevel.

One feature of my invention consists in the peculiar construction of the joint by which the two members of the square are united,

vention as set forth in the claims at the end' of this specification.

Figure 1, is a side view of the joint which unites the two members of my square. Fig. 2, is a longitudinalsection through the same on the line 2. 2. of Fig. l. Fig. 3, is a section on the line 3. 3. of Fig. 1. Figs. 4, and 5, are detached views of the adjacent ends of the two members. Fig. 6, is a view yon a reduced scale showing the instrument when set as a bevel and the application of the supplemen tary square thereto. Fig. 7,*is a section through the clamping head of lthe supplementary square on the line 7. 7. of Fig. 6.

The two members A, andv B, of the square are united by side plates C, and D. VThese plates are secured rigidly to the member B,

by rivets e, or otherwise, and to the member A, by frictional contact induced by clamping screws F, and G, the first of which lies in the right angled slot H,'H, and the other ina notch I, in the member A, The abutting ends of the members are peculiarly formed, A, having a straightv portion a, an inclined portion a', and a curved portion a2, against which rest the correspondingly shaped portionsvb, b', b2, of the edge of the member B, when the instrument is used as a square. The member B, has also a lug or projection l', which tits into the outerhend of the notch I, and serves to positively lock the two members of the square against accidental disarrangement. does to some extentetfect the same purpose but it is not as accurate'and reliable in this particular as the projection I.

When it is desired to set the instrument as va bevel or to fold it, the set screws are loos#k ened and the member B, raised or moved end'- sign J, and that the member A, has a graduated arc, by means of which the instrument The screw G, lying in the slot when used as a bevel may be set to any desirod angle as will be clear from an inspection of Fig. 6.

To insure greater accuracy inthe setting of the instrument at any of its angles either as a square or a bevel, I form in one face of the member A, a groove la, lo', k2, which is taken into bya stud pin L, on the inner faceof the plate C. When the instrument is used as a square this stud stands in the lower end of the groove 7c. When it is to be used'as a bevel the stud swings around the groove k2, bearing against its inner-wall los, the set screw F, forming the pivot at the center h. When it is'desired to take the two members apart, the set screw F, is taken out and the stud pin L, may then be withdrawn from the groove lc.

The supplementary square M, shown in Flg. 6, is provided with a spring clamping head m, and a set screw N, by means of which 1t may be clamped upon the member B, of the main instrument.

When the instrument thus equipped is used for laying out stair work and other like purposes it may be at once set to any desired dimensions for risers and treads and the work marked on" without further calculation, the tread line being given by the outer side x, of the member B, the riser line bythe outer side y, of the supplementary square, while the inner edge z, of the main member A, slides along the edge of the stair board or Stringer Which is being laid out.

The right angled portion or extension H', of the slot I-I, admits of the screw F, being moved far enough back to permit the edges of the two members of the square being brought close together when the instrument is folded for transportation.

Having thus described my invention, what I claim as new and useful, and desire to secure byLetters Patent, is-

1. The combination of the separable members A, B, of a square having correspondingly shaped abutting edges and having respectively the interlocking notch I, and projection I', and the side plates rigidly attached to one member and embracing the end of the other which is also slotted at H, with the clamping screw F, lying in the slot H, all arranged and operating substantially as set forth.

2. The combination of the separable members A, B, of a square having correspondingly shaped abutting edges, the side plates rigidly attached to member B, and embracing the end o f member A, the two clamping screws passing through the plates and lying respectively in the slot H, and notch I, of member A, substantially as hereinbefore set forth.

3. The combination of the separable members A, B, of a square, the side plates rigidly attached to one ot lthe members, the clamping screws passing through the plates and lying respectively in the slot H, and notch I, of the other member which is also provided with the guide groove k, 7c', k2, in its face, and the stud pin L, all arranged and operating substantially as hereinbefore set forth.

4. The combination of the separable members A, B, of a square, the side plates, the clamping screws lying respectively in the slot H, H', and in notch I, the abutting edges of the two members having correspondingly curved portions, the radius of which is equal to the distance from the center of one set screw to the nearest side of the other, substantially as hereinbefore set forth.

5. The combination of the separable members A, B, of a square, the side plates, the clamping screw F, passing through the right angled slot H, H', the steady pin L, andthe guide groove la, 7c', 702, in one of the members 'the portion 7a2, of which is curved about a center located at the intersection of the portions I'I, H', of the slot, substantially as and for the purpose hereinbefore set forth.

6. The combination of the separable members A, B, of a square, hinge jointed together so as to iiex edgewise, with the supplementary try square M, having a screw clamping head adapted to embrace the edge of one`mern ber of the main square and a blade extending to and across the other member, substantially as and for the purpose set forth.

In testimony whereof I affix my signature, in the presence of two witnesses, at Cleveland, Ohio, November l0, 1893.

JOHN GEGRGE ZUCK.

Witnesses:

WM. A. SKINKLE, CORNELIA A. SKINKLE. 

